[gnome-photos/wip/rishi/thumbnailer: 5/13] Update to latest libgd

[Debarshi Ray <debarshir src gnome org>]

commit f622d3f1a8e8e874f2aa72b7977db4bea8bbaed3
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Feb 21 13:49:35 2017 +0100

    Update to latest libgd
    
    GdMainIconBoxChild now expands the thumbnail as the GtkFlowBox is
    resized.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777869

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 97a852c..a4e70c2 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 97a852cdf3d37776f9c98f730d7dcbbe995bdeb7
+Subproject commit a4e70c286ebfe1d526aca267f3a029591ebc1e03